Could be somewhat off topic
When dealing with fixed length records, it was recommended to use pack / unpack pair. See "Perl Best Practices" by Damian Conway for more. With this, here is another solution that reflects this recommendation:
use strict;
use warnings;
my $spat = qr/(?:abc|xyz)/;
while(<DATA>) {
chomp;
my $r = $_;
my @flds = unpack "(A3)*", $r;
print "$r => ";
do { print "$_ " if /$spat/ } for @flds;
print "\n";
}
__DATA__
abcmmmnnn
mmmxyznnn
xyzfooabc
mabcmxyzm
-BR
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